A Research on DOC Assisted DPF Regeneration Technology with In-cylinder Fuel Post-Injection and Exhaust-pipe Fuel Injection
To overcome the problems of burner-type regeneration scheme, i. e. the difficultly in forming flame and the tendency of miss-fire, leading to secondary pollutions, a diesel particulate filter ( DPF) regeneration system combining in-cylinder fuel post-injection and exhaust-pipe fuel injection is adopted with the effects of in-cylinder fuel post-injection on engine performance studied by bench tests. For meeting the requirements of operation temperature of diesel oxidation catalyst (DOC), engine tests are also conducted in different working conditions with exhaust temperatures in the range of 250~350益, so the optimal quantity and timing of in-cylinder post-injection and the quantity of exhaust pipe fuel injection for different conditions are obtained with their corresponding maps shown.
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